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(#) Missing density folder

!!! WARNING: Missing density folder
   This is a warning.

Id
:   `IconMissingDensityFolder`
Summary
:   Missing density folder
Severity
:   Warning
Category
:   Usability: Icons
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   Initial
Affects
:   Resource files
Editing
:   This check can *not* run live in the IDE editor
See
:   https://developer.android.com/guide/practices/screens_support.html
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/IconDetector.java)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/IconDetectorTest.java)
Copyright Year
:   2011

Icons will look best if a custom version is provided for each of the
major screen density classes (low, medium, high, extra-high,
extra-extra-high). This lint check identifies folders which are missing,
such as `drawable-hdpi`.

Low density is not really used much anymore, so this check ignores the
ldpi density. To force lint to include it, set the environment variable
`ANDROID_LINT_INCLUDE_LDPI=true`. For more information on current
density usage, see https://developer.android.com/about/dashboards.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
res/drawable-nodpi/frame.xml:Warning: Missing density variation folders
in res: drawable-hdpi, drawable-xhdpi, drawable-xxhdpi
[IconMissingDensityFolder]
0 errors, 3 warnings
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here is the source file referenced above:

`res/drawable-nodpi/frame.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;selector xmlns:android="http://schemas.android.com/apk/res/android"&gt;
    &lt;item  android:color="#ff000000"/&gt; &lt;!-- WRONG, SHOULD BE LAST --&gt;
    &lt;item android:state_pressed="true"
          android:color="#ffff0000"/&gt; &lt;!-- pressed --&gt;
    &lt;item android:state_focused="true"
          android:color="#ff0000ff"/&gt; &lt;!-- focused --&gt;
&lt;/selector&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/IconDetectorTest.java)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `IconDetector.testNoDpiMix`.
To report a problem with this extracted sample, visit
https://issuetracker.google.com/issues/new?component=192708.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="IconMissingDensityFolder" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'IconMissingDensityFolder'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore IconMissingDensityFolder ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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